Hear, hear on the Fun House and the Earthquake! Man, do I have great memories of those. Fun House lasted until at least '77 or '78 tho, as I remember it vividly and was born in '70. Or were you saying the aquarium went in in '70? If so, disregard.
I agree that Fascination will be sorely missed (I've still got 92 coupons!), but I wouldn't call it a mistake. It was 50 years old and replacement parts were too few and far between, from what I've heard. Better it went now then spend the next few years with half the alleys closed.
Disaster Transport gets my vote for biggest mistake. Avalanche Run was so-so, but if they were going to invest a few mil, why put AR in a box and add a few cheesy special fx in '90 rather than just tear the thing down and build a better, new coaster? Eventually, I'm guessing that's what will be done anyway.